Double-tube-formed stiffened-edge cap



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v DOUBLE TUBE FORMED STIFFENED EDGE CAP Filed July 24, 1923 INVENTOR.

CHA m. ES A MMER.

Patented dune 3, 1924..

UNITED STATES PATENT OFFICE.

DOUBLE-TUBE-FOBMED STIFFENED-EDGE GAP.

Application filed July 24,

To all whom it may concern: I

'Be it known that I, CHARLES HAMMER, a citizen of the United States, residing at Hollis Court Boulevard, in the county of -Queens and State of New York, have inyented certain new and useful Im rovements 1n Double-Tube-Formed Sti cued-Edge Caps, of which the following is a specification.

This invention relates to metal caps or;

closures for containers, articul'arly for glass containers, the object t ereof being to pro.- vide a metal cap havin an improved reinforced or strengthene lower edge, the

present invention being an improvement in part upon that shown and described in my .Patent No. 1,079,238, dated November 18,

For sanitary as well as for safety reasons metal caps are now most frequently made with what is commonly designated in the trade as a wire edge, that is, the dependin flange or skirt is provided with a rolle curled or beaded edge, which strengthens the cap and prevents it from rusting, and also prevents liability of cutting the hands of the user. Such a form of strengthened edge is shown in m prior patent referred to, but as shown in ig. 3, this curled edge is so rolled as to form a coil having a single opening therein, thereby forming what may be designated as a single tube, and this is the usual way of forming a coiled edge whether the metal be cur ed sufliciently to overlap, as shown in said Fig. 3 of the patent or whether the raw edge merely engages the side of the flange, it still forms but a single tube. Whereas in the resent improvement the rolled edge is so ormed that it forms a plurality of tubes side by side, and as is well known, an arched construction is stronger than a flat one, it thereforefollows that this double tube or rolled edge formation is materially stiffer and stronger, than a single tube formation, and therefore. the object of the resent improvement is the provision of a ouble tube formed rolled edg: cap.

the drawings accom an ing and forming a part of this speci cation, Fig. 1 is a glen view of this 1m roved cap looking at t e interior thereof; ig. 2 is a side view of the cap; Fig. 3 is a cross sectional view taken on line 3-3 F 1 looking in the direction of the arrows; 4 is a cross sectional view of a portion of t e cap illustrating the first 1923. Serial No. 658,418.

step in the manufacture of this im roved double tube formed cap; Fig. 5 is a ottom view of thev cap when rovided with instruck locking projections; ig. 6 is a cross sectional view through one of the projections taken on line 66 Fig. 5 looking in the direction of the arrows; Fig. 7 is a bottom view of this improved cap when provided with a different form of locking projection, this being shown in the "form of wedge or threadlike projection; Fi 8 is a side view of the cap shown in Fig. Fig. 9 is a cross sectional view taken on line 9-9 Fig. 7 looking in the direction of the arrows; and Fig. 10 illustrates this improved capprovided with one projection.

Similar characters of reference indicate corresponding parts in the several figures of the drawings.

Before explaining'in detail the present improvementand mode of operation thereof, I desire to have it understood that the invention is not limited to the details of construction and arran ement of parts which are illustrated in t e accompanying drawings, since the invention is ca able of other embodiments, and that the p raseology which I employ is for the purpose of description and not of limitation.

This improved cap comprises a top 2 having'a depending flange or skirt 3 provided with a strengthened lower edge, which is. formed by first providing the cap with a single complete coil 4 by turning the lower raw ed e of the cap upon itself until the raw or ree edge engages or substantially engages the side wall of the flange as at 5 in Fig. 4. This complete coiled edge is then inturned within a further portion of the flange of the cap as at 6, Fig. 3 until the curved side of the coil 4 is brou ht into engagementor substantially so wit the flange of the cap as at 7 Fig. 3 thus 'formlng what may be termed a ouble tube or double rolled edge, that is a rolled edge which, when rolled under not too great pressure, has two 8 and 9, each lengthwiseextending open separated. one

being completely closed an from the other.

It willbe understood that the hollow formation of the tubes depends somewhat upon the amount the are rolled or compressed, and therefore i compressed to a ater extent than that shown, the tubular formation will be less, althou the manner of formi the strengthened e ge and the advantages 0 the stifiening features thereof will not be departed from. That is to say, the coiled portion 4 shown in Fig. 4 could be made tighter or looser, and this is likewise true of the structure as shown in Fig. 3; in fact, these coiled portions could be so tight that the tubular opening would be very small, but nevertheless the result would be to all intents and purposesa double rolled or double tube formed strengthened edge. Thus, this improved double rolled edge is formed by first bending the lower free or raw edge of the cap flange upwardly and inwardly upon itself to bring the raw' or free edge of the flange or the bent portion thereof adjacent to or into engagement with the side wall of the flange, and then this so bent portion is again bent upon itself to bring the curved or side face of the previously bent portion adjacent to or into en agement with the side wall of the flange. I n the present instance these bends are at the outer side of the flange.

It has been found in practice that this form of strengthened edge very materially strengthens the lower edge of the cap, it being very much stiffer than a single tube formed coil or bead.

This improved cap may have various forms of locking projections. That is to say,

the projections may be in the form of inwardly projecting lugs 10, such as those shown in Figs. 5 and 6, wherein the double tube formed bead is forced inwardly b a suitable pressure or flattening of the coi or the cap may be provided with one or more threadlike or wedge-formed'projections 11 (see Figs. 7, 8 and 9). In the latter form shown, these projections are relatively narrow and deep at the entering end thereof ang wide and shallow toward their opposite en In the cap shown in Fig. 10, the flange is provided with but one lockin wedge or threadlike projection 14 extending substantially around the flange of the cap and forming what may be. considered as a continuous thread. In all forms of cap the flange is provided with a suitable roughened or corrugated surface 13, the corrugations extending down to the projections, and these corrugations not only strengthen the cap. and the flan e thereof, but also the projections, which are in turn strengthened by the double tube formed edge. These corrugations also provide a suitable gripping surface for the user as well as for the manufacturer in turning the caps on to the containers by machinery, and they also form a suitable feeding means in the formation of the caps by the cap forming rolls.

This improved cap is manufactured in the preferred way by suitable cap forming rolls, in which the raw or free ed e of the cap is coiled to form a substantia y complete coil edge is at the opposite side of such were as at 4, Fig. 4, and then'asthe rolls progress around the cap, this'complete coil is again formed into another complete coil as at 9, Fig. 3, these coils being thus formed by suitable pressure on the metal of the cap at the lower edge thereof. During this operation the instruck locking projections of the forms shown or of any suitable form are also provided in the ca and likewise the corrugations, although in some instances and forms of caps the projections may be formed separately after the double coiled edge is provided.

As it is desirable to form these metal caps of comparatively thin metal, it follows that unless the lower edges thereof are relatively stiff, the depending flange or skirt will,.in the application of the ca to the container, have a tendency to sprea or yield outwardly, so that the locking lugs or projections will not efliciently engage the lugs or threads or the projections of the container, and will not always take up the necessary variations in the glass threads of the container, but by the stifi'ening of the lower edge in the manner described, this is very materially prevented, and in fact the lower edge is so effectively stiffened by the resent improved method of formin the rofied edge, that it does not yield to t e extent that caps with a single tube formed edge do, and in consequence the cap will resist outward compression or distortion so that the can be more effectively and efliciently loclxed upon the container. In the form of locking rojection shown in Figs. 5 and 6, this is ormed from the double tube formed edge, while in the form shown in Figs. 7, 8, 9 and 10,

the wedge projection is located between the rolled e ge of the (island the corru ations, but in all forms it be seen that t e double tube formed rolled edge very materially reinforces and stifiens the projections, preventing their displacement, and distortion in the application of the cap, which is applied to the container by rotating it thereon. It will be observed that in Fig. 6 as the corrugations come down to the working face of the lugs while the double tube formed working face the displacement of the In in their application to the jar is material y prevented, and the same is substantially true of the forms of cap shown in Figs. 7, 8, 9 and 10 for substant ally the same reasons.

It is to be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of the several claims or the requirements of the prior art.

Having thus explained the nature of my said invention and described a way of constructing and using the same, althou h without attempting to set forth all of e more locking projections therein and pr vided at its lower edge with a double tube formed rolled edge.

3. metal cap for containers comprising.

a top and a corrugated depending. flange having one or .more locking projections therein and its lower edge provided with a double tube formed strengthened portion.

4. A metal cap for containers compris ing a top and a corrugated depending flange having one or more locking prqections therein and its loweredge provided with a double tube formed strengthened portion located at the outside of the flange.

5. A metal cap for containers comprising a top having a depending flange provided with a pair of superimposed tubes comprising a coiled part enclosed within a further portion of the flange, thereby forming a double tube strengthened edge.

6. The method of strengthening the lower edge of a metal cap having a top and a depending flange, which consists in first coiling the free edge of the flange to form a complete tube, and then coiling this complete tube to form another tube'separated from the y first .tube, thereby forming a double tube edge.

7. A metal cap having a top and a depending flange, the lower portion of which is provided with a complete rolled edge having the free edge of the flange in engagement with the face of the metal, and a side face of such rolled portion in engagement with the side face of the flange, thereby forming a pair of superimposed tubes.

8. A metal cap having a top havin a depending flange provided with a doub e hollow rolled edge, the freeedge of one roll being in substantial engagement with the side face of the metal, and the side face of said roll being in substantial engagement with the side face of theflange at the outer side thereof thereby forming a pair of superimposed tubes.

Signed at 1822 Park Row Building, New York, N. Y., this 20th day of July, 1923. 

